* vm_insnhelper.c (vm_search_super_method): raise a TypeError
  instead of a NotImplementError if self is not an instance of the
  current class.  [ruby-dev:39772] [Bug #2402]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38761 b2dd03c8-39d4-4d8f-98ff-823fe69b080e